Now that school has started (or is starting soon) for most kids, we parents are going to find that we need help reinforce their learning at home. Here's a simple way to practice the math concept of counting on. No supplies, no prep time, nothing.: Now that school has started (or is starting soon) for most kids, we parents are going to find that we need help reinforce their learning at home. Here's a simple way to practice the math concept of counting on. No supplies, no prep time, nothing.